Volunteers age 12 and older help remove buffelgrass and fountain grass from 8 to 11 a.m., every second and fourth Wednesday; and every third Saturday; free. Work may require hiking and working on steep slopes. Meeting locations are in Tucson Mountain Park. Details are given with RSVP, which is required. Call 615-7855, or email email@example.com to RSVP or for more information.